It is accepted now. btw, if you report it - that is enough. We'll see that. :)
If it was accepted 2 years ago, now is not the case....I will report it....
"These streets are very important" is quite different from "These are very important streets" - which is why (I think) it is no longer accepted. The first describes the streets, the second describes these. "These" could be anything. What are these? These are hats. What are these? Important streets.
These streets are very important = Ezek az utcák nagyon fontosak.
These are very important streets. = Ezek nagyon fontos utcák.